Antioffset mechanism for printing presses



Aug. 9, 1927.

R. J. GREENWAY QFFSET MECHANISM FOR PRINTING fRESSES ANTI- Filed March 3, 1925 I INVENTOR ATTORNEYS Patented Aug. 9, 1927.

the anti-offset powder may the carrier and Y 8 are so arranged as sheet carrying cylinder rea stares teasers me I f RICHARD J..eannnwaY, or wn'srnntr'anomi ISLAND, ASSIGNOE 1 00.3. oor'rnELL & sons COMPANY, or sronmeron, oonnnoarour, A CORPORATION: or DELA WARE.

,Application filed. March 3, 1925. Serial no. 12,845.-

The object of my invention is to provide certain improvements in the construction, form and arrangement of the several elements of the anti-offset mechanism whereby be efficiently and thoroughly applied to the freshly printed side of the sheet or web; said elements including a rotary carrier and a travelingendless belt having the same surface speed as arranged for Contact (preferably extended. contact) with the sheet or web while on the carrier, and a rotary per forated anti-offset powder containing roll being employed for applying the anti-offset powder to the belt for transfer thereby onto the freshly printed side of the sheet or web, means being provided for vibrating the roll and for rotating it at a considerably lesser surface speed than the belt, to ensure the proper distribution of the powder.

A practical embodiment of my invention is represented in the accompanying drawings, in which Fig. 1 represents in side elevation so much of a printing press as includes my improved anti-ofiset mechanism.

Fig. 2 represents a vertical section through the same.

Fig. 3 represents a detail cross section taken in the plane of the line IIIIII of Fig. 1. g

Fig. 4 represents a detailsection taken in the plane of the line IV--IV of Fig. 3.

The rotary carrier is herein shown as a 1, provided with sheet grippers 2, the shaft 3 of which cylinder 'is suitably mounted in the frame 4:.

The endless belt 5 passes around the drive roll 6, the idler rolls 7 and 8 and'the belt tightener roll 9. These rolls are all suitably mounted in the frame 1 and the rolls 7 and to cause the endless belt 5 to have an extended contact with the freshly printed side of the sheet on the carrier. V

The rotary perforated anti-offset powder containing roll 10 has itsshaft 11 suitably mounted in the frame 4, for both rotary and vibratory movement, saidshaft having sleeves 12 and13 resting upon rotary cams 1 1 and 15, carried by a shaft 16 driven from the shaft '17 of the drive roll 6 through the gears 30, 31 for imparting the vibratory movement to said roll 10. The rotary movement is imparted to the said roll through the geared connection 18, 19 between the shaft ll and the drive roll shaft 17 This belt drive roll shaft 17 is driven fromthe rotary sheet carrier gear'QO through the gear 21, shaft 22, bevel gears 28, 2 1, shaft 25 and bevel gears 26, 27. v I

The endless belt 5 and the rotary carrier 1 are driven at the same surface-speed and the anti offset powder containing roll 10 is driven at a lesser surface speed, in the present instance about one-eighth the speed of the belt. r The structure of the perforated anti-offset powder containing roll 10 is as follows: i

The roll is provided with an annular series 7 of lengthwise elongated slots 28 covered by a line mesh wire cloth 29 which is herein shown in the-form of a cylinder inserted into the roll 10, it being understood however,

that this wire cloth cylinder may be placed 7") either inside or outside of theroll, as desired. It will be seen from the above description that I am enabled to distribute the anti-ofiinvention; hence, I 'do not intend to limit I myself to the particular embodiment herein shown and described, but

What I claim is 1. A rotary carrier'for a freshly printed sheet or web, atraveling endless belt ar-. ranged for extended contact with the sheet or web while on the carrier, and a rotary perforated anti-offset powder containing roll arranged in position to distribute the powder to the belt for transfer'thereby onto the freshly printed exposed side of the sheet or web. v

2. A rotarycarrier for a freshly printed sheet or web, a travelingendless belt arranged for extended contact with the sheet or web while on the carrier, a rotary'per- 105 forated anti-ofiset powder containing; roll arranged in position to distribute the powder to the belt for transferthereby onto the freshly printed f'exposed side of the sheet and belt att-he same surface speed and the roll at a; lesser surface speed.

7 4, A rotary carrier for a freshly printed sheet-or web, a traveling endless beltarranged for contactwith the sheet or web while onthe carrier, a rotary perforated anti-offset powder containing roll arranged 1n position to d stributethe powder onto the belt for transfer thereby onto the; freshly printed exposed side of the sheet or web,

A and'nieans for vibrating the roll.

5. A rotary carrier for a freshlyprinted sheet'orr-web, -ai traveling endless belt arranged for extended contact with the sleet or Webwhile on the carrier, a rotary perforated anti-offset powder containing roll arranged in position todistribute the powder onto the beltfor transfer thereby onto or web, and means for vibrating roll,

6. vA rotary carrier for a freshly printed sheet or Web, a traveling endless belt arranged for contact with the; sheetv or web while on the carrier, a rotary perforated antiplfset powder containing-r011 arranged in position to distribute the powder onto i the belt for'transfer thereby onto the freshly printed exposed side of the sheet or web, means for driving the carrier and belt at the same surface speed and the powder eontaining roll at a lesser surface speed,and means for vibrating the said roll.

7. A rotary carrier for a freshly printed sheet or Web, a traveling endless belt arranged for extended contact with the sheet or web while on the carrier, a rotary'perforated anti-offset powder containing roll arranged in position todistribute the powder onto the belt for transfer thereby onto the freshly printed exposed side of the sheet or web, means for driving the 'carrier and belt at the same surface speed and the powder containing roll at alesser surface speed, and means for vibrating the said roll.

In testimony, that I claim the foregoing as my invention I have signed my name this 27th day of February, A. D. 1925;

RICHARD J. GREENWAY. 

